The Smithsonian is going to have an exhibit on a subject I expect you will understand to be near and dear to me: video games as an art form.
I agree completely that video games are just like any other expression of the human experience. They have an extra layer though — they involve, to varying degrees, the interactivity of the player.
Yes, some video games are simple duplications of things like sports or city-building, but many are fully realized interactive worlds. There are some whose interactivity is limited artificially despite the pretensions that you are in a world where your choices have real consequences, in such a way that you can tell you’re really in a world-on-rails, e.g. the Fable games, or to a lesser extent the inFamous games. Even games that ostensibly give you full control of the world, sandbox games where you are given a full city or province to wreak havoc or right wrongs like Skyrim, you are still constrained by the plot elements provided by the designers — the branching, Choose Your Own Adventure style tree of plot format with the option of including a pendulum-like karma system.
But despite those constraints, I defy you to find me a single book, painting or movie that approaches this ability to create vivid landscapes that change as you command them to do so.
You should probably also see the other videos on the exhibit over at the American Art Museum channel.